Hammer mill



Oct. 12, 1937. r w. J. WILKINS 2,095,584

HAMMER MILL Filed D80. 5, 1935 5 Sheets-Sheet 2 [I fi+ 6 in van [or W WWW/77.5"

g A llorneys Oct. 12, 1937.

Filed Dec. 5, 1955 W. J. WILKINS HAMMER MILL 3 Sheets-Sheet 5 7 I nvenlor W? WWW/2w Patented Oct. 12, 1937 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to crushers and grinders, and more particularly to feed mills for grinding oats, corn, rye and grains of a similar character.

The primary object of the invention is the design of complementary cage sections that form the flailing chamber which permits the lid or cover section of the casing to be hinged to the base section and at the same time provide for greater screening area that enables the operator to put more grain through the mill and reduce operating expenses.

Another feature of the invention is to make a quadrant of the cage that is mounted in the lid of the casing demountable.

Further objects of the invention are to provide a device of the character referred to that is strong, compact and durable, thoroughly reliable for its intended purpose, easily installed in grain mills, and that is comparatively inexpensive to manufacture. 7

With the foregoing and other objects in view the invention consists of a novel construction, combination and arrangement of parts as will be hereinafter more specifically described and illustrated in the accompanying drawings wherein is disclosed an embodiment of the invention, but it is to be understood that changes, variations, and modifications may be resorted to without departing from the spirit of the claim hereunto appended.

In the drawings wherein like reference characters denote corresponding parts throughout several views:

Figure 1 is a top plan view of the device in accordance with the present invention with the lid in closed relation.

Figure 2 is a detailed vertical section taken substantially on the plane of line 2-2 of Figure 1 and looking in the direction of the arrows.

Figure 3 is a transverse vertical section in 'detail taken substantially on the plane of line 33 of Figure 2 and looking in the direction of the arrows.

Figure 4 is a front elevation of the mill.

Figure 5 is a perspective view of the bottom section of the casing with the 'lid or cover removed and the hammers removed.

Figure 6 is a perspective view of the demountable portion of the cage removed from the lid section of the casing.

Figure 7 is a perspective fragmentary view of the end of the casing showing the manner in which the sections are hinged together.

Referring to the drawings in detail, it will be seen that the casing for the mill is made of a bottom section or base A substantially rectangular in configuration over which fits the lid or cover section B of the casing and the cover or lid section swings to open position on a horizontal axis as will hereafter appear. The bottom of the base section A is open and the open bottom communicates with a fan compartment or a screw conveyor compartment (not shown).

In the center of the upper edge of the vertical side walls 1 of the base A there are aligned recesses 8 that receive the journal bearings for mounting the hammer driveshaft 9 across the casing. The inner end of a feed hopper ID is hinged as at II to the upper portion of one end wall l2 of the base A. The inner end of the hopper I!) registers with a space 13 in the cover section B through which space the grain to be treated is fed to the cage as will presently appear. Hopper I 9 is supported by a pair of braces l4 extending in a diagonal direction. The lower ends of the braces it are secured to the lower portion of the side wall I as at 15. The upper ends of the braces are secured as at IE to the sides of the hopper. So as to permit the hopper In to be lowered on the hinges l l to permit the cover B to be swung to open position either one of the brace fastening means [5, l6 may be removable. The cover or lid section of the casing is formed of upright end walls I! which merge with the top wall [8 and the opposite side walls l9 join with the end walls I! and the top wall H3. The bottom of the cover or lid section B is open and fits over the open upper end of the base section A. Along the lower edge of the side walls IQ of the cover or lid are inset lips 20 which overlap the upper edges of the side walls 7 when the cover is closed. The entrance space I3 is formed in the lower portion of the forward end wall l1 of the cover. On the forward portion of the cover or lid B are a pair of ears which abut like ears 22 on the upper portion of forward end wall l2 of the 'base. The confronting pair of cars 2|, 22 are formed'with registering apertures to receive the ends of a hinge rod 23. The cover B swings on the hinge rod 23 as a pivot.

There is a cylindrical cage disposed across the inside of the casing. The forward portion of the cage is substantially tangent to the plane of the forward end walls of the base and cover section of the casing, while the rear portion of the cage is spaced from the rear end walls of the cover and base to allow for the passage of the milled grain through the open bottom of the base. The Cage is formed of a pair of complementary semicylindrical sections, the upper being indicated at C and the lower being indicated at D. When the base and lid of the casing are in closed position the sections of the cage form the cylindrical flailing chamber 24. The hammer driveshaft 9 extends in concentric relation with the flailing chamber and has a square core fixed thereto. From the'corners of the core 25 extend radially spaced grain treating hammers 26 that swing on pins 26a. On one projecting end of the driveshaft 9 is a pulley 21 which may be connected by belting to a drive pulley (not shown) whereby the hammers 26 are rotated in the flailing chamber for the treatment of the grain.

The lower half of the cage is removable and is formed of a perforated unitary plate 28 of a substantially semi-circular configuration having the side edges 28a slidably retained in aligned interrupted channels 2% there being one channel on,

each side wall '2 of the base A. Plate 28 is perforatedthroughout its entire area and bridges the space between the side walls I. At the forward end the edge 230 of the plate 28 terminates below the upper edge of the base A and a heavier arcuate bar 29 fluted on its outer face is secured at its ends to the side walls of the base to form a continuation of the plate 28. The heavier plate 29 lies under the hopper l0 because the force of the milling at this point requires sturdy construction. The other end of the plate 28 terminates flush with the upper edge of base A. The interrupted channels 281) are each formed by welding an arcuate bar 36 to each side wall I of base A. The bars are in alignment with each other and have the same curvature as the plate 28. Spaced above the bar are a series of circumferentially spaced lugs 311a rounded slightly in a transverse direction. The series of lugs describe an arc of the same curvature as plate 28 and form in cooperation with the bar 30 the interrupted channel 28b in which the side edges 28a slide.

The upper half C of the cage is carried by the lid or cover B and moves with the cover as it is opened and closed. The upper half of the cage 0 is made with an imperforate fixed plate 3! of arcuate configuration and a demountable perforate metal plate 32 which is also arcuate in configuration. Plates 3| and 32 are each a quadrant of a circle in circumference and when they are placed in end to end relation they form the upper half of the cage. The ends of the plate 3| are welded to the side walls IQ of the cover B. Plate 3! is imperforate except for ,the opening 33 therein which registers with the hopper It! and space l3 whereby grain is fed into the flailing chamber 25. The opening 33 is controlled by a gate closure 34, the edges of which slide in the spaced guide bars 35 one on each side of the opening. Extending into the interior of the casing is a supporting plate 36 having the upper ends secured to the top wall l8 as at 31. Plate 36 has a flat bar 38 on the free edge and opposed portions of the bar 38 project outwardly, forming a sill or ledge to support the confronting ends of the plates 3|, 32.

The upper end of plate 3| is secured to bar 38 as at 39. There is an angle bar 40 secured to the margin at the lower end of plate 36 leaving a "space or pocket between bar 38 and one leg to receive the upper end of the perforated plate 32. The lower end of perforated plate 32 has a pair of spaced straps 4i one secured to each face of the plate and the strapsprojected below the free lower edge to provide a pocket 42 in which seats the upper edge of plate 28 when the lid B is closed. The side edges 43 of the demountable plate 32 slide between a series of pairs of inwardly extending lugs M, 45. The pairs of lugs M, 65 are secured at their inner ends to the side Walls I9 of the cover B. The pairs of lugs are circumferentially spaced from one another to form the series. By this arrangement the demountable plate 32 may be removed from and assembled in the lid B when the same is opened permitting the change thereof with ease and dispatch. Furthermore, the arrangement of the perforated demountable plate 32 enables me to obtain a greater area of screening in the flailing chamber.

When the plate 23 is assembled in the interrupted channel 2% and the upper end edge is seated in pocket 42, both plates are held in tight fitting relation. When the cover B is raised plates 32 and 28 may be easily removed.

Bridging the inside of base A and below the cage are transversely extending stay bolts 46 spaced from one another. The end of these stay bolts are secured to the side walls I forming a 1 reinforcement for the base A.

Having described my invention, claim is:-

A hammer mill comprising a casing formed of a lid and a base separable from each other, a rotary hammer journaled in one of the sections and extending through the casing, arcuate flailing cage plates separable with the casing sections forming a continuous flailing chamber surrounding the periphery of the hammer, certain of the flailing cage plates being perforated for three quadrants and the remaining quadrants being imperforate and provided with a valve controlled opening through which the grain is introduced to the flailing chamber, means carried by the casing sections to slidably receive the perforated plates, one edge of one of the perforated plates formed with a channel overlapping the confronting edge of an adjoining perforated plate to join the ends of the perforated plates together when the casing sections are closed, said first mentioned means including an arcuate bar and a series of spaced lugs positioned above said bar to provide an interrupted channel, said bar and lugs carried by opposed walls of one casing section, and a series of pairs of spaced lugs arranged in an arc and fixed to the opposed walls of the other casin section.

what I WILLIAM J. WILKINS. 

